JPH0540683Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a drive coil for a coreless motor, and in particular, to a drive coil for a coreless motor that is wrapped in a molded insulator and attached to a substrate. be.

[Prior art] Conventionally, this type of coreless motor has been manufactured by winding self-fused wire to create an air-core drive coil, positioning it on the surface of a board or stator yoke using a jig, and applying adhesive or The drive coil is fixed with double-sided tape.

As shown in Figure 7 of the attached sheet, there is also a molded insulator made of resin, which has a plate-shaped, approximately fan-shaped flange 1, and has a winding core 2 erected approximately at the center of the upper surface of the flange 1. form 3. A drive coil 4 is attached to the winding core 2.
The terminals 5, 5 are wrapped around metal relay pins 6, 6 protruding from the collar 1 and soldered. After that, as shown in FIG. 8, the relay pins 6 of the molded insulator 3, around which the drive coil 4 is wound, are placed at predetermined positions on the board 8 to which the stator yoke 7 is attached.
6 is inserted and fixed with soldered P is also proposed.

[Problems to be Solved by the Invention] In the conventional coreless motor described above, one side of the drive coil is attached using an adhesive or double-sided tape while positioning the drive coil with respect to the board. This positioning requires accuracy, and the end of the drive coil must be routed and soldered, making the work complicated.

In order to improve this, a drive coil having the configuration shown in FIGS. 7 and 8 was proposed, and the workability of attaching the drive coil to the board and connecting terminals was significantly improved. However, as shown in FIG. 8, the gap G1 between the stator yoke 7 and the rotor magnet 9
is larger by an amount corresponding to the thickness T of the flange 1 compared to the case where the drive coil 4 is directly attached to the stator yoke 7. Therefore, there is a defect that the gap on the magnetic circuit becomes large and the torque characteristics become somewhat inferior.

Therefore, a technical problem arises that must be solved in order to form a drive coil that has good workability during assembly and also improves torque characteristics.The present invention aims to solve this problem. With the goal.

[Means for Solving the Problems] This invention was proposed to achieve the above object, and has a flat plate-shaped flange and a winding core at approximately the center of the upper surface of the flange. In a coreless motor drive coil, which is an upright molded insulator made of resin, the drive coil is wound around the winding core, and the terminal thereof is connected to a metal relay pin protruding from the flange. The flange of the molded insulator that comes into contact with the effective torque-generating conductor portion of the drive coil is removed, an opening is provided at a predetermined position in the stator yoke, and the flange of the molded insulator is inserted into the stator yoke. It is an object of the present invention to provide a drive coil for a coreless motor, characterized in that a conductor portion is brought into close contact with a stator yoke.

[Function] In this invention, a molded insulator is formed by removing a portion of the flat plate-shaped flange, and a drive coil is wound around the winding core of the molded insulator. Here, considering the generation of rotational torque in each part of the drive coil, the conductor part in the radial direction with respect to the rotor axis is the effective conductor part for generating rotational torque, and the flange of the molded insulator is the effective conductor part for generating rotational torque. The parts that abut the parts have been removed. Then, by making an opening in the stator yoke corresponding to the remaining flange, inserting the flange of the molded insulator, and soldering the relay pin to the board, the effective conductor part of the drive coil will be tightly attached to the stator yoke. It can be installed with the Therefore, the gap on the magnetic circuit can be made as small as possible to prevent deterioration of the rotational torque characteristics.

Furthermore, by soldering the relay pins of the molded insulator to predetermined positions on the board, the drive coil can be fixed and electrically connected to the board at the same time, so each terminal of the drive coil can be routed around the board. The drive coil can be easily positioned using the relay pin.

[Embodiment] Hereinafter, an embodiment of this invention will be described in detail with reference to FIGS. 1 to 6 of the attached drawings. For convenience of explanation, conventionally known technical matters will also be explained at the same time. FIGS. 1 and 2 show a molded insulator 10 made of resin, in which a winding core 12 is erected at the center of the upper surface of a flat plate-like, generally fan-shaped flange 11. The left and right protruding parts of the flange 11 are removed, and both side surfaces 11a and 11b of the flange 11 are formed on the same plane as both sides of the winding core 12. A plurality of metal relay pins 13 and 14 are implanted in the winding core 12, and their lower ends protrude toward the lower surface of the flange 11.
Further, a notch 15 is formed in one side 11b of the molded insulator 10 at a position near the relay pin 14. Furthermore, the protruding piece 1 is placed at an appropriate position on the lower surface of the flange 11.
6 and 16 are provided in a protruding manner, and can be used for positioning when attaching to a board, which will be described later.

Then, the self-fusion wire is wound around the winding core 12 of the molded insulator 10 to form the drive coil 17 as shown in FIGS. 3 and 4. As mentioned above, both sides 11a and 11b of the flange portion 11 are connected to the winding core portion 12.
Since the conductor parts 17a and 17b on both sides of the drive coil 17 are removed in the same plane as the molded insulator 10, the conductor parts 17a and 17b protrude from the molded insulator 10 to the left and right. One terminal 18 of the drive coil 17 is wrapped around one relay pin 13 protruding from the lower surface of the flange 11, and the other terminal 19 is inserted into the notch 15 and connected to the other relay pin 13. It is tied to the pin 14. Thereafter, each terminal 18, 19 is connected to both relay pins 13, 14 by soldering. still,
Instead of winding the self-fusion wire directly around the winding core 12, an air-core drive coil may be formed separately and fitted onto the winding core 12, and each end may be entwined with the relay pins 13 and 14.

In this way, a plurality of drive coils 17 integrated with the molded insulator 10 are attached to predetermined positions on the substrate 20, as shown in FIG. A rotor shaft hole 21 is drilled in the substrate 20, and a disc-shaped stator yoke 2 is inserted into the rotor shaft hole 21.
2 is attached to the surface of the substrate 20. A plurality of drive coils 17, 17, . . . are attached to symmetrical positions on the circumference of the rotor shaft hole 21 on the substrate 20 to which the stator yoke 22 is attached. Fifth
As shown in FIG. 6, the stator yoke 22
The flange 11 of the molded insulator 10 is located at a predetermined position.
An opening 23 is provided in which the board 20 is to be inserted, and an insertion hole 2 is provided in the substrate 20 within this opening 23.
4,24 have been drilled.

Then, the flange 11 of the molded insulator 10 around which the drive coil 17 is wound is fitted into each opening 23 of the stator yoke 22, and the relay pins 13 and 14 of the molded insulator 10 are inserted through the board 20. It is inserted into the holes 24, 24 and fixed to the back side of the board 20 with solder P. Therefore, the drive coil 17 integrated with the molded insulator 10 can be fixed to the substrate 20 and electrical connection can be made, and the assembly work can be simplified by omitting the work of gluing the drive coil to the board in the conventional type. can be simplified. Moreover, since the terminals 18 and 19 of the drive coil 17 are not routed around the substrate 20, there is no risk of defective products such as wire breakage.
Further, soldering P can be performed by dip processing together with other electronic components to be attached to the board 20, and assembly can be easily automated.

Here, to describe the generation of rotational torque at each part in the drive coil 17, the conductor parts 17a, 17 in the radial direction with respect to the rotor shaft hole 21 in FIG.
b is an effective conductor site for generating rotational torque. As described above, since the radial conductor portions 17a and 17b of the drive coil 17 protrude from the molded insulator 10, the drive coil 17 is attached with the lower surfaces of the conductor portions 17a and 17b in close contact with the surface of the stator yoke 22. . Therefore, as shown in FIG. 6, the conductor portion 17 which is an effective conductor portion for torque generation
a, 17b directly contact the stator yoke 22,
The gap G2 between the stator yoke 22 and the rotor magnet 25 is smaller than the gap G1 of the conventional coreless motor explained in FIG. 8 by an amount corresponding to the thickness T of the flange.

In this way, the gap on the magnetic circuit can be made as small as possible to prevent deterioration of the rotational torque characteristics, and it is possible to obtain the same rotational torque characteristics as a conventional configuration in which an air-core drive coil is directly attached to the stator yoke. Can be done.

[Effects of the invention] As detailed in the above-mentioned embodiment, this invention forms a molded insulator with a part of the plate-shaped flange removed, and a drive coil is wound around the winding core of the molded insulator. . The fixing and electrical contact of the drive coil can be performed at the same time, the work of adhering the drive coil with adhesive or double-sided tape is omitted, and there is no need to route each terminal of the drive coil to the board. . Therefore,
The installation work of the drive coil becomes easier, and wire breakage can be prevented and the reliability of the product can be improved.

Furthermore, the effective conductor portions of the drive coil for generating torque are projected on both sides of the molded insulator, and the effective conductor portions of the drive coil can be brought into close contact with the stator yoke when the molded insulator is attached to the opening of the stator yoke. Therefore, rotational torque characteristics similar to those of a structure in which the air-core drive coil is directly attached to the stator yoke can be obtained.

In addition, as long as the purpose and effect of this invention are consistent,
This invention is not limited to the above-mentioned example,
Naturally, this also applies to other similar configurations.

[Brief explanation of the drawing]

Figures 1 to 6 show an embodiment of the present invention, in which Figure 1 is a plan view of a molded insulator, Figure 2 is a perspective view of the same, and Figure 3 is a molded insulator wrapped around a drive coil. A plan view of the body, FIG. 4 is a sectional view taken along line A-A in FIG. 3,
FIG. 5 is a plan view of the main part of the board to which the drive coil is attached, and FIG. 6 is a sectional view taken along the line B--B in FIG. 5. 7 and 8 show a conventional example, in which FIG. 7 is a perspective view of a molded insulator, and FIG. 8 is a vertical cross-sectional view of a main part of a substrate to which a drive coil is attached. 10... Molded insulator, 11... Flange, 12...
Winding core portion, 13, 14... Relay pin, 17... Drive coil, 17a, 17b... Conductor portion, 18, 1
9...terminal, 20...substrate, 22...stator yoke, 23...opening, G1, G2...gap.

Claims (1)

[Scope of utility model registration request] A resin molded insulator having a flat plate-shaped flange and a winding core erected approximately in the center of the upper surface of the flange, and a drive coil is wound around the winding core and the terminal thereof is In the drive coil of the coreless motor, which is connected to a metal relay pin protruding from the flange, the flange of the molded insulator that comes into contact with the effective torque-generating conductor part of the drive coil is removed, and the flange of the stator yoke is 1. A drive coil for a coreless motor, characterized in that an opening is provided at a position, into which a flange of the molded insulator is inserted, and the effective conductor portion of the drive coil is brought into close contact with a stator yoke.